Lawmakers investigating the George Washington Bridge lane closures want more details about who edited the testimony that a top Port Authority executive gave to the Legislature in November.

That official, former Deputy Executive Director Bill Baroni, later resigned. He told the Assembly’s Transportation Committee that the lane closures — which created giant traffic jams in Fort Lee over four days in September — were part of a traffic study. Baroni was not testifying under oath, and his traffic-study explanation was later contradicted by documents from the Port Authority and Governor Christie’s office.

Sixteen of the 18 subpoenas the Legislature’s investigatory committee issued on Monday demand documents related to Baroni’s testimony, according to a confidential list obtained by The Record.

Lawmakers investigating the George Washington Bridge lane closures want more details about who edited the testimony that a top Port Authority executive gave to the Legislature in November.

That official, former Deputy Executive Director Bill Baroni, later resigned. He told the Assembly’s Transportation Committee that the lane closures — which created giant traffic jams in Fort Lee over four days in September — were part of a traffic study.

Baroni was not testifying under oath, and his traffic-study explanation was later contradicted by documents from the Port Authority and Governor Christie’s office.

Sixteen of the 18 subpoenas the Legislature’s investigatory committee issued on Monday demand documents related to Baroni’s testimony, according to a confidential list obtained by The Record.

“There are a lot of people who, from what we can see today, had some role in all of this,” said Assemblyman John Wisniewski, D-Middlesex.

Among other details, the subpoenas also demand records from the state police aviation unit and any documents from the governor’s office for the Christie reelection campaign related to Fort Lee Mayor Mark Sokolich.

One of the subpoenas goes beyond the bridge scandal entirely. It demands documents from the Port Authority relating to the organization’s controversial 2011 toll hike; information about the proposed train tunnel under the Hudson River, which was eventually canceled by Christie, citing cost overruns; and communication between the governor’s office and the authority involving candidates the office recommended for Port Authority jobs.

The 18 subpoenas issued on Monday came in addition to 20 the panel issued last month. Documents responding to those subpoenas are still coming in, lawmakers say, although two people — Bridget Anne Kelly, a former deputy chief of staff for Christie, and former Christie campaign manager Bill Stepien — have refused to comply with the demands for documents, citing their Fifth Amendment rights against self-incrimination.

The central question for the committee, Wisniewski said, is why Kelly sent an email to the Port Authority’s director of interstate capital projects, David Wildstein, on Aug. 13 telling him, “Time for some traffic problems in Fort Lee.”

“We are looking for questions to that very basic question: Who told her to send it? What were the conversations that led to her sending it?” Wisniewski said.

In Baroni’s Nov. 25 testimony before the Assembly committee, he said the lane closures were part of a traffic study examining whether delays could be reduced by reassigning the lanes.

Two weeks later, Port Authority Executive Director Pat Foye, a New York appointee, testified under oath that he was unaware of any study.

Now, lawmakers say they want to know more about Baroni’s traffic-study testimony.

“Did anybody help him write the testimony? Did anybody coach him to deliver it?” said state Sen. Loretta Weinberg, D-Teaneck, one of the investigative committee’s co-leaders.

A letter Wildstein’s lawyer wrote to the Port Authority last month contends a lawyer working for the authority was “counseling” Baroni for “four to five days” before he testified to the committee.

Legislators say they have seen copies of Baroni’s testimony that include edits.

“Who was doing the editing? Because it’s not just any old testimony. It’s testimony that many observers agree was trying to obfuscate the facts around the lane closures,” said Wisniewski, the committee’s other leader.